我想去,但是我没有时间。
wǒxiǎngqù , dànshì wǒ méiyǒu shíjiān 。
I want to go, but I don't have time.
他很聪明,但他不努力。
tā hěn cōngmíng , dàn tābù nǔlì 。
He is very smart, but he doesn't work hard.
这个问题很难,但我会努力解决。
zhègè wèntí hěn nán , dàn wǒ huì nǔlì jiějué 。
This problem is difficult, but I will try to solve it.